According to the customs of British peerage, a woman takes the title of her husband, meaning Meghan would become HRH Princess Henry of Wales, but she's not a British "blood" princess, so calling her Princess Meghan would be incorrect.

THE QUEEN WOULD HAVE A SAY IN THE MATTER.

It has become tradition that the Queen grants her sons—and in the case of Prince William, her grandsons—a royal dukedom on their wedding day. (Prince Edward is a notably exception to this rule.) Not only is it a lovely gesture, but it also gives their wives the title of Duchess, so they don't awkwardly have to go by their husband's first name. (Shout out to Princess Michael of Kent!)

While nothing is for certain, it's very likely Harry would be given the title of Duke, and Meghan the title of Duchess once they are married.

BUT OF WHERE?

Royal Central, a website reporting on all things monarchical, is predicting Harry will be named the Duke of Sussex upon his marriage, a title that has been available for over a century. (The last Duke of Sussex was Prince Augustus Frederick, the sixth son of King George III, and an uncle of Queen Victoria's.)

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"Most likely, he will be created a Duke. Sussex is available so [Markle] would be HRH the Duchess of Sussex," royal historian Marlene Koenig said. "Her rank would be a princess by marriage of the United Kingdom, Great Britain, and Northern Ireland."